WO2011154595A1 - Ensemble rotor et échangeur de chaleur rotatif comprenant un rotor - Google Patents

Ensemble rotor et échangeur de chaleur rotatif comprenant un rotor Download PDF

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Publication number
WO2011154595A1
WO2011154595A1 PCT/FI2011/050503 FI2011050503W WO2011154595A1 WO 2011154595 A1 WO2011154595 A1 WO 2011154595A1 FI 2011050503 W FI2011050503 W FI 2011050503W WO 2011154595 A1 WO2011154595 A1 WO 2011154595A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
axial
circumferential
plenum
air
Prior art date
Application number
PCT/FI2011/050503
Other languages
English (en)
Inventor
Aki Rosenqvist
Jukka SETÄLÄ
Original Assignee
Swegon Ilto Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Swegon Ilto Oy filed Critical Swegon Ilto Oy
Publication of WO2011154595A1 publication Critical patent/WO2011154595A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/047—Sealing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/10—Rotary wheel
    • F24F2203/104—Heat exchanger wheel

Definitions

  • the present invention relates to a rotor assembly for a rotary heat exchanger and particularly to a rotor assembly according to the preamble of claim 1 , the rotor assembly comprising: a rotor arranged to rotate around a rotation axis, the rotor having a first side and a second side in the direction of the rotation axis, a circumferential sealing unit arranged around the periphery of the rotor for isolating the first side and the second side of the rotor, a first axial sealing unit on the first of the rotor for dividing the first side of the rotor to two adjacent plenums and a second axial sealing unit on the second side of the rotor for dividing the second side of the rotor to two adjacent plenums.
  • the present invention further relates to a rotary heat exchanger and particularly to a rotary heat exchanger according to the preamble of claim 1 in which inlet air is heated to supply air by using thermal energy of discharge air such that the discharge air is cooled to outlet air
  • the rotary heat exchanger having a rotor unit comprising: a rotor for carrying out the heat exchange, an inlet plenum for conducting inlet air to the rotor, a supply plenum for receiving supply air from the rotor, a discharge plenum for conducting discharge air to the rotor, an outlet plenum for receiving outlet air from the rotor, a circumferential sealing unit for isolating the inlet plenum from the supply plenum and discharge plenum from the outlet plenum, a first axial sealing unit for isolating the inlet plenum from the outlet plenum and a second axial sealing unit for isolating the supply plenum from the discharge plenum.
  • a rotary air-to-air heat exchanger otherwise known as heat or enthalpy wheel is a regenerative heat exchanger where a mass made of corrugated channels rotates through airstreams. Adjacent supply and exhaust air streams each flow through half of the wheel in a counter flow direction.
  • a rotary heat exchanger offers high efficiency heat recovery and is a common choice of heat exchanger in a ventilation unit.
  • a limitation of the rotary heat exchanger is cross contamination or mixing of the two air streams which occur by carryover and leakage across the seals surrounding the rotor and separating the air streams.
  • An object of the present invention thus to provide a rotor assemble and a rotary heat exchanger so as to overcome the above mentioned prior art disadvantages.
  • the objects of the invention are achieved by a rotor assembly according to the characterizing portion of claim 1 wherein at least one of the sealing units is provided with a pressure balancing volume for balancing the pressure difference over the sealing unit.
  • the objects of the invention are achieved by a rotary heat exchanger according to the characterizing portion of claim 1 wherein at least one of the sealing units is provided with a pressure balancing volume between the plenums.
  • the present invention uses a pressure balancing volume and an extra seal to complement the existing seals in the rotor assembly.
  • the rotor assembly of a rotary heat exchanger functions such that inlet air is heated to supply air by using thermal energy of discharge air such that the discharge air is cooled to outlet air.
  • inlet air is heated by discharge air in the rotor assembly of the rotary heat exchanger such that the inlet air becomes heated supply air and the discharge air becomes cooled outlet air.
  • the rotor assembly comprises an inlet plenum on the first side of the rotor for conducting inlet air to the rotor, a supply plenum on the second side of the rotor for receiving supply air from the rotor, a discharge plenum on the second side of the rotor for conducting discharge air to the rotor and an outlet plenum on the first side of the rotor for receiving outlet air from the rotor.
  • the rotor assembly is further provided with a circumferential sealing unit for isolating the inlet plenum from the supply plenum and discharge plenum from the outlet plenum, in other words for isolating the first side of the rotor from the second side of the rotor.
  • the rotor assembly further comprises a first axial sealing unit on the first side of the rotor for isolating the inlet plenum from the outlet plenum and a second axial sealing unit on the second side of the rotor for isolating the supply plenum from the discharge plenum.
  • the mentioned sealing units are provided with a pressure balancing volume for balancing the pressure difference over the sealing unit.
  • the pressure balancing volume is provided to the sealing unit between the adjacent plenums.
  • the sealing unit is further provided with two sealing elements provided between the pressure balancing volume and the adjacent plenums. Thus there is one sealing element between one plenum and the pressure balancing volume and another sealing element between the other plenum and the pressure balancing volume.
  • the sealing elements are provided such that they are at least partly pressure permeable for balancing the pressure difference between the adjacent plenums in the pressure balancing volume.
  • the present invention has the advantage that it provides a similar function as the pressure balancing damper without the associated disadvantages since no or reduced resistance needs to be supplied to the extract ducting. Furthermore, using the pressure balancing volume of the present invention decreases or prevents the leakage problems in connection with the rotor assembly of a rotary heat exchanger.
  • figure 1 is schematic view of a rotor assembly
  • figure 2 is schematic view of prior art rotary heat exchanger
  • figure 3 is schematic view of another prior art rotary heat exchanger
  • figure 4 is a graph showing leakage through a prior art rotary heat exchanger
  • figure 5 is graph showing leakage through a prior art rotary heat exchanger having a pressure balance damper
  • figure 6 is rotor assembly according to the present invention.
  • figure 7 shows an axial sealing unit of figure 6
  • figure 8 shows a circumferential sealing unit of figure 6
  • figure 9 is a graph showing leakage through the rotary heat exchanger of the present invention.
  • a conventional rotor assembly for ventilation unit or rotary heat exchanger is shown in figure 1 .
  • the rotor assembly comprises a rotor 1 , a rotor box 2, divider planes 4, 5 for isolating air streams.
  • a first axial seal 7, also known as transverse seal, is used to isolate the air streams on first side 12 of the rotor 1 .
  • Similar second axial seal 10 is provided on the on the second side 13 of the rotor 1 .
  • a circumferential seal 6, also known as peripheral seal, is used to form a seal around the outside periphery 3 of the rotor 1 to reduce leakage flow via the internal of the rotor box 2 from the first side 12 of the rotor 1 to the second side 13 of the rotor 1 and vice versa.
  • a single plane or plate surrounding the rotor periphery 3 may be used to divide the upstream, first side 12 of the rotor 1 , and downstream, second side 13 of the rotor 1 , sides of the rotor 1 .
  • the rotor 1 has a first side surface 24 on the first side 12 of the rotor and a second side surface 25 on the second side 13 of the rotor 1 .
  • FIG. 1 There are various pressure zones surrounding the rotor assembly. These pressure zones are shown in figures 2 and 3 and described below.
  • a conventional prior art rotary heat exchanger having a rotor unit 30.
  • the rotor unit comprises a rotor 1 , an inlet plenum 14 into which fresh outside air is conducted as inlet air I.
  • the inlet air I is conducted to the rotor 1 in which it is heated to supply air S which is received to the supply plenum 15 from the rotor 1 .
  • the supply air S is further conducted to a room 32 by using a supply fan 34. From the room 32 air is dis- charged as discharge air D conducted to discharge plenum 16 of the rotor unit 30.
  • the discharge air D is conducted from the discharge plenum 16 to the rotor 1 in which it is cooled such that it transfers heat to the inlet air I.
  • the cooled discharge air D is received to the outlet plenum 17 as outlet air O and the outlet air is extracted by using discharge fan 36.
  • the inlet plenum 14 and the outlet plenum 17 are on the first side 12 of the rotor 1
  • the supply plenum 15 and the discharge plenum 16 are on the second side of the rotor 1
  • the inlet plenum 14 and the outlet plenum 17 as well as the supply plenum 15 and the discharge plenum 16 are isolated or separated from each other by using axial sealing units.
  • a first axial sealing unit comprises the first axial seal 7 and the first axial divider 4 for isolating the inlet plenum 14 from the outlet plenum 17 on the first side of the rotor 1 .
  • a second axial sealing unit comprises the second axial seal 10 and the second axial divider 5 on the second side of the rotor 1 .
  • a circumferential sealing unit comprises one or two circumferential seals 6 and one or two circumferential dividers 2, as shown in figures 2 and 3.
  • Inlet air I is taken from the outside at the atmospheric air pressure PA.
  • the air passes through the inlet duct and due to the pressure drop caused by the resistance of the inlet duct has a pressure P1 in the inlet plenum 14.
  • the supply air S After passing through the rotor 1 the supply air S has a reduced pressure of P2 at the supply plenum 15.
  • From the supply plenum 15 the air is drawn through supply fan 34 and passes through the supply duct to the ventilated room 32. In the room 32 it is assumed that the pressure is that of atmospheric air pressure PA since in normal ventilation installation the pressure is close to that of atmospheric pressure PA.
  • the discharge air D is drawn through the discharge duct and due to the duct losses has a pressure of P3 in the discharge plenum 16.
  • the discharge air D passes through the rotor 1 and due to the resistance of the rotor 1 the outlet air O has a reduced pressure of P4 in the outlet plenum 17. From the outlet plenum 1 7 the outlet air O is drawn through the discharge fan 36 and is driven through the exhaust duct.
  • a balance damper 38 can be placed between the extract duct and the rotor 1 in the location shown in figures 2 and 3.
  • the internal pressure of the rotor box 2 PO is the average of the P1 , P2, P3 and P4 pressures when the circumferential seals 6 are of the same design, as is shown in figure 2.
  • the rotor 1 has a single rotor wall and not a rotor box 2, as is shown in figure 3, for there is only one circumferential sealing unit having the circumferential seal 6 between the respective plenums 14, 15 and 16, 17 on the opposing sides 12, 13 of the rotor 1 .
  • the rotor box 2 of figure 2 is replaced with circumferential divider extending around the periphery 3 of the rotor 1 . Therefore in figure 3 there is only one circumferential seal 6 that separates the pressure P1 in inlet plenum 14 and the pressure P2 in the supply plenum 15. The same applies for the discharge plenum 16 and the outlet plenum 17.
  • the curve between point i, ii and iii show a range of inlet duct pressure P1 to discharge duct pressure P3 differences.
  • Figure 4 is then an example of the leakages through the rotary heat exchanger seals 7, 1 0, 6 with a prior art seal arrangement with no countermeasures, such as balance damper 38, are used to improve this.
  • the axial seal leakage "m” and circumferential seal leakage "p" are positive indicating that the leakage flow into supply side of the rotor, inlet plenum 14 and supply plenum 15, hence in the wrong direction since this leakage contaminates the air supplied to room 32.
  • Figure 6 shows a rotor assembly having a rotor 1 and a first axial seal 7, second axial seal 10 and a circumferential seal 6.
  • the invention is characterised in that the seals 7, 10, 6, or at least one of them, are provided with provided a pressure balancing volume 8, 9, as shown in figures 7 and 8.
  • the seals 7, 10, 6 form together with the axial dividers 4, 5 and the circumferential divider 2 sealing units respectively.
  • Figure 5 A shows a first embodiment of the second axial seal 10 of the present invention.
  • the second axial seal 10 comprises a wall portion 26 which together with the second axial divider 5 forms a pressure balancing volume 8.
  • the first and second axial seals 7, 10 are provided respectively in connection with the first and second side surfaces 24, 25 of the rotor 1 , as shown in figure 6, for sealing the gap between the dividers 4, 5 and the side surfaces 24, 25 of the rotor 1 .
  • the second axial seal 10 is provided with two sealing elements 22, 23 provided between the pressure balancing volume 8 and the adjacent plenums 15, 16.
  • the first axial seal 7 respectively with two sealing elements between the between the pressure balancing volume 8 and the adjacent plenums 14, 17. Therefore the second axial seal 10 comprises a first axial sealing element 22 between an axial pressure balancing volume 8 and supply plenum 14 and a second axial sealing element 23 between an axial pressure balancing volume 8 and the discharge plenum 16.
  • the circumferential seal 6 comprises a wall portion 27 which together with the circumferential divider 2 forms a circumferential pressure balancing volume 9.
  • the circumferential seal 6 is provided in connection with the periphery 3 of the rotor 1 or the outside edge of first or second side surface 24, 25 of the rotor 1 , as shown in figure 8, for sealing the gap between the circumferential divider 2 and the periphery 3 and/or side surfaces 24, 25 of the rotor 1 .
  • the circumferential seal 6 comprises a first circumferential sealing element 20 between a circumferential pressure balancing volume 9 and the first side 12 of the rotor 1 and a second circumferential sealing element 21 between a circumferential pressure balancing volume 9 and the second side 13 of the rotor 1 .
  • first circumferential sealing element 20 is between the circumferential pressure balancing volume 9 and the inlet plenum 14 or the outlet plenum 17
  • second circumferential sealing element 21 is between the circumferential pressure balancing volume 9 and the supply plenum 15 or the discharge plenum 17.
  • Figures 7A, 7B, 7C, 8A, 8B and 8C show different kinds of embodiments of the pressure balancing volume 8, 9 and the sealing elements 20, 21 , 22, 23.
  • the sealing elements 20, 21 , 22, 23 are arranged to be pressure permeable such that allow the pressure of the adjacent plenums 14, 15, 16, 17 to balance.
  • the sealing elements 20, 21 , 22, 23 may provided as brush type sealing element, cloth type sealing element, a narrow gap or diffusion gap.
  • the narrow gap may be provided with the axial divider 4, 5 or with the circumferential divider 2 or with the wall portions 26, 27 defining the pressure balancing volume 8, 9.
  • the narrow gap is thus provided between the side surface 24, 25 or the periphery of the rotor 1 and the divider 4, 5, 2 or the wall portion 26, 27.
  • the narrow gap provides a high resistance to the hinder leakage flow.
  • the circumferential pressure balancing volume 9 is arranged to extend circumferentially around the periphery 3 of the rotor 1 or the outside edge of the side surface 24, 25 of the rotor 1 .
  • the circumferential seal 6 is arranged to the circumferential divider 2 such that the circumferential seal extends between the circumferential divider 2 and the periphery 3 of the rotor 1 .
  • the axial pressure balancing volume 8 is arranged to extend across a first and second side surface 24, 25 of the rotor 1 on the first and second side 12, 13 of the rotor 1 , respectively.
  • the axial seals 7, 10 are arranged to the first and second axial dividers 4, 5 such that the axial seals 7, 10 extend between the axial divider 4, 5 and the side surface 24, 25 of the rotor 1 .
  • the axial pressure balancing volume 8 is arranged such that it sits offset from the rotation axis 1 1 and the circumferential pressure balancing volume 9 is arranged such that it covers an area of the side surface 24, 25 of the rotor 1 .
  • the cross sectional area of axial pressure balancing volume extends across the full side surface 24, 25 of the rotor 1 .
  • the cross sectional area of the circumferential pressure balancing volume 9 follows circumferentially around the periphery 3 of the rotor.
  • the cross section of the pressure balancing volume 8, 9 may be may be rectangular, triangular, polygonal, circular, oval or any other shape.
  • the overall volume of the pressure balancing volume 8, 9 may be chosen according to the application and the parameters of the rotor 1 and the rotary heat exchanger.
  • the pressure balance volume 8, 9 can take any form such as to create a suitable pressure balancing effect.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

Cette invention concerne un rotor et un échangeur de chaleur rotatif dans lequel de l'air d'admission (I) est chauffé pour former de l'air d'alimentation (S) en utilisant l'énergie thermique de l'air de refoulement (D) de telle sorte que l'air de refoulement (D) est refroidi pour former de l'air de sortie (O). L'échangeur de chaleur comprend : un rotor (1), un plénum d'admission (14) pour acheminer l'air d'admission (I) vers le rotor (1), un plénum d'alimentation (15) pour recevoir l'air d'alimentation (S) à partir du rotor (1), un plénum de refoulement (16) pour acheminer l'air de refoulement (D) vers le rotor (1), et un plénum de sortie (17) pour recevoir de l'air de sortie (O) provenant du rotor (1). Ledit échangeur de chaleur comprend en outre une unité d'étanchéité circonférentielle (2, 6) et une première unité d'étanchéité axiale (4, 7). Les unités d'étanchéité (2, 6 ; 4, 7 ; 5, 0) sont dotées d'un volume d'équilibrage de la pression (8, 9) entre les plénums (14, 15, 16, 17).
PCT/FI2011/050503 2010-06-09 2011-05-31 Ensemble rotor et échangeur de chaleur rotatif comprenant un rotor WO2011154595A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20105655 2010-06-09
FI20105655A FI20105655A0 (fi) 2010-06-09 2010-06-09 Roottorikokoonpano ja pyörivä lämmönvaihdin, jossa on roottori

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WO2011154595A1 true WO2011154595A1 (fr) 2011-12-15

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WO (1) WO2011154595A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2573496A1 (fr) * 2011-09-20 2013-03-27 Swegon ILTO Oy Ensemble formant rotor et unité de récupération de chaleur/énergie dotée de l'ensemble formant rotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062129A (en) * 1976-08-02 1977-12-13 Takasago Thermal Engineering Co., Ltd. Arrangement for preparing hot compressed air of reduced moisture content suitable for use in operation of blast furnace
GB2119037A (en) * 1982-04-22 1983-11-09 Steinmueller Gmbh L & C A sealing system for a regenerative heat exchanger
WO1988008112A1 (fr) * 1987-04-16 1988-10-20 Fläkt Ab Echangeur thermique rotatif
US5137078A (en) * 1990-05-11 1992-08-11 Borowy William J Air heater seals

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062129A (en) * 1976-08-02 1977-12-13 Takasago Thermal Engineering Co., Ltd. Arrangement for preparing hot compressed air of reduced moisture content suitable for use in operation of blast furnace
GB2119037A (en) * 1982-04-22 1983-11-09 Steinmueller Gmbh L & C A sealing system for a regenerative heat exchanger
WO1988008112A1 (fr) * 1987-04-16 1988-10-20 Fläkt Ab Echangeur thermique rotatif
US5137078A (en) * 1990-05-11 1992-08-11 Borowy William J Air heater seals

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2573496A1 (fr) * 2011-09-20 2013-03-27 Swegon ILTO Oy Ensemble formant rotor et unité de récupération de chaleur/énergie dotée de l'ensemble formant rotor

Also Published As

Publication number Publication date
FI20105655A0 (fi) 2010-06-09

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